order distributed feedback lasers
Distributed feedback terahertz frequency quantum cascade lasers with dual periodicity gratings
... ble which correspond to the fundamental frequencies of the two superimposed gratings. The intensity of the mixed har- monic peaks due to the clipping effect is here largely reduced compared with that seen previously ...
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Temporal and frequency characteristics of distributed feedback dye lasers
... In this case the Nd:YAG pump laser was slow Q-switched to produce SLM pulses. The DFDL alignment was however slightly reduced by a reduction of tlie beam overlap in the vertical direction. The effect of this on the DFDL ...
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Optofluidic distributed feedback lasers with evanescent pumping : reduced threshold and angular dispersion analysis
... DFB lasers with a different number of second-order periods (4, 8, and 12 ...second- order periods, the divergence of the laser emission increases, ...
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Riechel, Stefan (2002): Organic semiconductor lasers with two-dimensional distributed feedback. Dissertation, LMU München: Fakultät für Physik
... Distributed feedback resonators based on nanopatterned substrates have shown to be a very promising method to fabricate organic semiconductor thin film ...In order to concentrate the emission to a ...
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The fabrication and lithography of conjugated polymer distributed feedback lasers and development of their applications
... Also of note is the difference in exposure times between this work and that of Rose et al. who typically expose their device to the vapour for 2 minutes and report a 30-fold increase in sensitivity (ASE) afforded by a 1 ...
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Continuous-wave highly-efficient low-divergence terahertz wire lasers
... cascade lasers (QCLs) have undergone rapid development since their demonstration, showing high power, broad-tunability, quantum-limited linewidth, and ultra-broadband ...(via distributed feedback ...
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Single-mode surface-emitting concentric-circular-grating terahertz quantum cascade lasers
... cascade lasers utilising non-uniform second-order distributed feedback ...ridge-waveguide lasers of similar size, whilst maintaining similar threshold current densities for the ...
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High Performance Broadband integrated GaAs ElectroOptic Absorption Modulators With Distributed Feedback Lasers in Optical Transmission Engineering Systems
... Silicon photonics has become a very attractive research area in the past decade due to the potential of monolithically integrating photonic devices with complementary-metal- oxide-semiconductor (CMOS) microelectronic ...
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Design method for ultimate efficiency in linear cavity continuous wave lasers using distributed feedback
... Developments in the single-moded high power pump sources open the way for the high power regime for rare-earth doped fibre lasers. In accordance with these developments we applied the new design method for ...
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Highly-photostable and mechanically flexible all-organic semiconductor lasers
... second-order distributed feedback (DFB) lasers with improved photo-stability based on, respectively, a nanocomposite and an encapsulated gain region, that are both compatible with the ...
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Design and characterization of widely tunable semiconductor lasers based on etched slots
... type lasers show a diagonal sym m etry line (ii) the tuning islands go from big tow ard small as the currents injected into the both m irror sections are increasing, w here for SG- DBR laser the tuning islands go ...
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Photonic crystal Bragg lasers : design, fabrication, and characterization
... The fabrication procedure consists of a series of lithography, etching, planarization, and metallization steps (see also Chapter 4). First, the photonic crystal lattice is defined using electron-beam lithography and ...
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Written peer-feedback to enhance students’ current and future learning
... the feedback con- ceptualisation proposed by Nicol (2011), other dimensions which define the feedback process could be analysed; for example, the forms of feedback proposed by Guasch et ...the ...
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Design of linear and star shaped macromolecular organic semiconductors for photonic applications
... applications can be achieved from di ff erent types of semiconductor structures, namely, monodisperse star-shaped molecules, complex linear macromolecules, and conjugated polymers. The most appropriate material for any ...
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Coherent imaging using laser feedback interferometry with pulsed-mode terahertz quantum cascade lasers
... optical feedback within the weak feedback regime, since at moderate to strong optical feedback levels the SM signal was found to be complicated by the presence of multiple cavity modes and mode ...
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Strong field physics and QED experiments with ELI-NP 2×10PW laser beams
... ELI-NP lasers [1, 2, 3, 4], electrons in the electromagnetic field are highly relativistic and the normalized transverse vector potential (giving the electron transverse momentum), a 0 = eA m c e 2 >> 1 , ...
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Nonlinear Dynamics in Directly Modulated Semiconductor Lasers with Optical Loop Mirror Feedback
... (NOLM) feedback using Ge doped optical fiber was carried out ...optical feedback level, carrier current and modulation signal strength are demonstrated as a tool to give insight into the laser ...
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Application of microwave diagnostics to copper chloride and carbon dioxide lasers
... OF ELECTRON RADIATION TEHPERATURE IN DOUBLE-PULSED COPPER CHLORIDE LASERS ~1EASUREt•lENTS Introduction to Copper Vapor Lasers 1 Lasers Operating in the Visible 1.2 Copper Lasers 1.3 Char[r] ...
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Fast distributed first-order methods
... Our method achieves exact convergence at the rate of O(1/t) (where t is the number of communication steps taken), which is superior than the rates of existing gra[r] ...
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Quantum dot micropillar lasers subject to coherent time delayed optical feedback from a short external cavity
... power-current and spectral characteristics. Firstly, we present the effects of delayed optical feedback from a short cavity on the input-output characteristics and the optical spectrum of a QD micropillar laser. ...
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